hendricks



Ap 1931. M. P. HENDRICKS 0 CALCULATING DEVICE Filed Aug. 10, 1925 2 Sheets-Sheet 1.

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CALCULATING DEVICE Filed Aug. 10, 1925 2 Sheets-Sheet 2 5 6'5 32 e- :Illl lllllllllli 6 6%.4:

m. i I 4| Patented Apr. 28, 1931 PATENT OFFICE MUBRAI P-HENDRICKS, OF WHEEIJING, WEST VIRGINIA CALCULATING DEVICE Application filed August 10, 1925. Serial No. 49,403.

' This invention relates to certain new and useful improvements in calculating devices, and has more particular reference to a portable device for facilitating addition and subtraction and which'is capable of being readily carried in the hand or pocket.

An object of the invention is to provide a calculating device of the above kind which maybe readily placed into practical use, and

which is extremely compact, simple and durable in construction. I

7 Another object isto provide a calculating device wherein means are provided for registering units, hundreds and thousands and embodying separate indicators therefor, and

wherein such indicators are so operatively associated that the use of complicated or delicate mechanism is avoided and the number of movable parts used is reduced to a minimum.

Other objects will appear as the nature of the invention is better understood, and the same consists in the novel form, combination and arrangement of parts hereinafter more 7 2 fully described, shown in the accompanying drawings and claimed.

a In the drawings, wherein like reference characters indicate corresponding parts throughout the several views,

Figurel is a top plan view of a calculating device constructed accordance with the present invention,

Figure 2 is a rear elevational view thereof,

Figure 3 is a front elevational view of the same,

' Figure 4 is a side elevational view of the device, a V

Figure 5 is a longitudinal section taken substantially upon line 5-5 of Figure 1,

Figure 6 is a transverse section taken substantially upon line 6-6 of Figure 1,

Figure 7 is a transversesectional view taken substantially upon line 7 -7 of Figure 5,

Figure 8 is an enlarged perspective view of a detail of the invention embodying the indicator or indicating thousands of units, and Figure 9 is a fragmentary view partly in elevation and partly in section illustrating the ellnanner in which the indicator disc is rotat Referring more in detail to the drawings, the present invention embodies a stationary base disc 5 having an annular upwardly projecting marginal flange 6 so as to provide a circular recess in which is fitted and secured a graduated disc 7 of cardboard, paper or the like, and a transparent disc 8 of celluloid, glass or the like, the disc 8 being provided to protect the disc 7 by completely covering the latter. The disc 7 is provided with a circular series of uniformly spaced graduation-s 9 upon themarginal portion of its upper surface, and these graduations are numbered from zero to ninety-nine, preferably in groups of ten as illustrated partially in Figure 1 at 10. The graduations are therefore 100 in number and are clearly visible through the marginal portion of the cover disc 8.

Rotatably disposed above and concentric with the base disc 5 is an indicator disc 11 whose diameter is slightly smaller than that of the disc 5 so that the graduations 9 and numbers 10 are left uncovered. The indicator disc 11 is formed upon its upper surface with marginal uniformly spaced depressions or pockets as at 12, and coincident with one of said pockets the disc 11 is provided with a peripheral indicator or indicating notch 13. A depression or pocket 12 is provided for registry with each of the graduations 9 of the base disc-carried graduated disc 7, and there are accordingly 100 of said pockets 12 provided in the disc 11.

The indicator disc is centrally attached to the upper end of a vertical shaft 14 which projects downwardly through a central opening 15 in the base disc 5 and has its lower end portion formed to provide a worm 16. The lower end of theshaft 14 is reduced as at 17, and this reduced end is journaled in a central opening provided in the horizontal intermediate portion of a U-shaped bracket 18 which has its ends suitably secured to the under side of the base disc 5 by soldering or the like. The shaft 14 further has an annular groove as at 19 in which is engaged the adjacent edge portions of plates 20 which are soldered or otherwise secured to the under side of the base disc 5 at opposite sides of the opening 15 in the latter,- The shaft 14 is thus effectively 169 journaled in proper position and restrained against longitudinal or endwise displacement.

A channel shaped casing 21 is provided upon the bottom of the base disc 5 so as to encase the shaft 14 and bracket 18, and this casing 21 is preferably secured in place by means of a transverse rivet 22 that passes through the side portions of the casing and also through aligned openings in the legs of the bracket 18 as clearly shown in Figures 5 and 6. The ends of the casing 21 are closed by means of depending plates 23 suitably secured to the underside of the base disc 5, such as by soldering or the like.

A horizontal shaft 24 is disposed longitudinally of and within the casing 21 and has one end ournaled in one of the plates 23 as at 25 (see Figure 2) the adjacent end portion of the shaft 24'being formed to provide a worm 26. The other end of the shaft 24 is provided with an annular groove as at 27 in which are engaged the adjacent edge portions ofplates 28 which are secured to the inner surface of the adjacent end plate 23 as shown clearly with respect to one of the same in Figure 5,. The end portion of the shaft 24 which is ournaled as at25 is reduced, and it will thus be seen that the shaft 24 is restrained against longitudinal displacement in an effective manner. The end portion of the shaft 24 which is formed with the groove 27 projects through the adjacent end plate 23 and terminates in a lateral pointer 29 which cooperates with a dial provided as at 30 upon the outer surface of said adjacent end plate as shown more clearly in Figure 3. The intermediate portion of the shaft 24 is formed with a pinion 31 which meshes with the worm portion 16 of shaft 14, and it will thusbe seen that when the indicator disc 11 is rotated, the shaft 24 is caused to turn. The graduations of the dial 30 are preferably 10 in number and the gearing between the shaft 24 and the disc 11 is such as to insure movement of the pointer 29 to the distance of one graduation of the dial 30 upon each revolution of the disc 11 so that the indication effected by the pointer 29 will represent 100 units for each graduation, a complete revolution of the pointer 29 indicating one thousand units.

Freely disposed within the casing 21 is a U-shaped member 32 one leg of which is formed with a threaded opening 33 engaged with the worm 26 of shaft 24, and the other leg of which is provided with a circular open.- ing 34 by means of which this portion of the member 32 is slidable longitudinally on the smooth end portion of shaft 24. The leg of the member 32 which has the circular opening 34 is provided with a laterally project.- ing arm forming a pointer 35 which pro: jects into a longitudinal slot 36 formed in the adjacent side of the casing 21 and provided along a side edge of the slot 36 are a plurality of graduations'37'. Itwill thus be seen that when shaft 24 is rotated, the member 32 is caused to move longitudinally of said shaft 24 so as to cause the pointer 35 to traverse the graduations 37. The gearing relation between the member 32 and the worm 26 is such as to cause the pointer 35 to move the distance of one of the graduations 37 upon each rotation of the pointer 29, the pointer35 thus indicating a thousand of units for each graduet 3. w ich t pa s an implement is preferably provided for actuation of the disc 11, and this implement preferablyconsists of a shank 38 formed intermediate its ends with a threaded portion as at 39 and provided with a pointed end as a t-40, the other end being in the form of a knurled knob or handle 41. The end plate in which the shaft 24 is journaled as at 25 is preferably provided with a threaded opening. into which the intermediate threaded portion 39 of the tool may be screwed so as to insure retention of the tool against loss when not in use. When. it. is. desired to ac: tuate the calculator the tool is simply threaded from the openingin the end plate23 which carries the same, and when held in the hand with the pointed end 40 engaged in one of the sockets 12 of-the disc 11, rotation of said disc. 11 may be effected.

Assuming that it is desired to find the total amount of 15, 6, and 8, the tool 38 will be engaged in t-hesocket 12 of the disc 11 which is coincident with the indicator notch 13, and then the disc 11 is turned to the right until the socket in which the tool is engaged is brought directly opposite the indication 15 on the dial disc 7. The tool is then removed from the socket coincident with the indicator notch 13 and placed in the socket 12 which is now coincident with the zero indication on the graduated disc 7, whereupon the disc 11 is again rotated to the right until the socket ongaged by the tool at this time is coincident with the indication 6 on the dial or graduated disc. 7. The tool is then again engaged in the socket which is now coincident with the zero mark on disc 7 and the disc 11 is for a third time rotated until the last mentioned socket is coincident with the indication 8 of the disc 7, whereupon it will be observed that the indicator notch 13 will be directly opposite to or coincident with the indication 29 of disc 7, which is the total of 15, 6 and 8. Thesame principle can be employed for obtaining other additions as is obvious.

When subtraction is to be done, the device is used slightly differently. For instance, assuming. that it'is desired to deduct 18 from 82, the indicator notch 13 will be moved to a position coincident with the indication 82 on the disc 7, after which the key" is engaged with the socket 12 which is then coincident with the. indication 18 "on disc 7 The disc 11 is then turned to the left until the socket with which the key is engaged is coincfident with the zero indication of the disc 7 and this will move the indicator notch 13 opposite the indication 64 of the disc 7, thus showin that the remainder is 64. Addition and su traction involving larger numbers will involve use of the dials 30 and 37 together with their cooperating pointers 29 and 35, hundreds of units being kept track of by observation of the'pointer 29, and thousands of units being observed by the position of the pointer 35 with regard to the graduations 37. It is to be noted that the indication of the dials 30 and 37 are to be read similar to dials of electric meters or the like wherein the pointers must reach the graduations before the total indicated thereby is included in the result.

7 In other words, should the pointer 29 move from the zero point of dial 30 but not quite reach the first graduation of said dial, it will be seen that the total does not include or involve a number as high as 100, while should the pointer 29 move to or past the first graduation ofv the dial 30 it will involve at least units.

From the foregoing description, it is believed that the construction and operation as well as the advantages of the present invention will be readily understood and appreciated by those skilled in the art.

Minor changes may be made without departing from the spirit and scope of the invention as claimed.

What I claim as new is:

In a device of the character described, a casing having one of its walls provided with a slot and with a scale adjacent the slot, a shaft rotatably supported within said casing in a plane below and parallel to said slot, said shaft having a screw-threaded portion and a smooth portion, a U-shaped member arranged Within the casing and having its legs provided intermediate their ends with shaft receiving openings, the wall of one opening being screw-threaded to fit upon the screw-threaded portion of the shaft, the wall of the other opening being smooth to fit upon and slide along the smooth portion of the shaft, the leg engaging the smooth portion of the shaft having a pointer extending to one side thereof and projecting through said slot, whereby as one leg is moved by the shaft the other leg will move the pointer, thereby causing the device to properly and efiiciently operate, as and for the purposes set forth.

In testimony whereof I afiix my signature.

MURRAY P. HENDRICKS. 

